Handle newlines (in both input and output)

[rrq/jonasforth.git] / sys.f

diff --git a/sys.f b/sys.f
index bc9dae9b53f5cae19ac523786215678299ae9e3c..0815e0fe0ca89d729a068e5072a4e8b721635460 100644 (file)
--- a/sys.f
+++ b/sys.f
@@ -9,3 +9,81 @@ EXIT [
   [ S" [" FIND >CFA , ]
   EXIT
 [ IMMEDIATE
+
+: IF IMMEDIATE
+  ' 0BRANCH ,
+  HERE @
+  0 ,
+;
+
+: THEN IMMEDIATE
+  DUP
+  HERE @ SWAP -
+  SWAP !
+;
+
+: ELSE IMMEDIATE
+  ' BRANCH ,
+  HERE @
+  0 ,
+  SWAP DUP HERE @ SWAP - SWAP !
+;
+
+: BEGIN IMMEDIATE
+  HERE @
+;
+
+: AGAIN IMMEDIATE
+  ' BRANCH ,
+  HERE @ - , ;
+
+: ( IMMEDIATE
+  BEGIN
+    READ-WORD
+    1 = IF
+      C@ 41 = IF
+        EXIT
+      THEN
+    ELSE
+      DROP
+    THEN
+  AGAIN ;
+
+: UNTIL IMMEDIATE
+  ' 0BRANCH ,
+  HERE @ - ,
+;
+
+( Compile a literal value into the current word. )
+: LIT, IMMEDIATE ( x -- )
+  ' LIT , , ;
+
+: / /MOD DROP ;
+: MOD /MOD SWAP DROP ;
+: NEG 0 SWAP - ;
+
+: C,
+  HERE @ C!
+  HERE @ 1 +
+  HERE ! ;
+
+: OVER ( a b -- a b a ) SWAP DUP ROT ;
+
+( Compile the given string into the current word directly. )
+: STORE-STRING ( str len -- )
+  BEGIN
+    OVER C@ C,
+    SWAP 1 + SWAP
+  1 - DUP 0 = UNTIL
+  DROP DROP ;
+
+: NEWLINE 10 EMIT ;
+: SPACE 32 EMIT ;
+
+( Read a number from standard input. )
+: READ-NUMBER READ-WORD PARSE-NUMBER ;
+
+S" Ready." TELL NEWLINE
+
+( vim: syntax=forth
+)